Full floating bundle
ASME and TEMA "B", "C" or "R" construction
Recommended for gas & liquid services.
For oil and other viscous fluid heaters with steam on the tube side.
No packed joint to leak and contaminate fluid
Gasketed joints are minimized
Provides multi-pass tube designs
U-bends allow for differential thermal expansion
Less costly than packed floating head or floating head designs, especially for higher tube side pressures since there is only one tubesheet, shell flange and head
Should be avoided where the tube side fluid is dirty or fouling since tubes can only be cleaned by chemical means.
True counter-current flow cannot be obtained since single pass on the tubeside is not possible.
Cannot be used where a temperature cross exists.